All coins are fractions of the United States dollar and are created by the United States Mint[?].
Several non-circulating bullion coins are also produced by the United States Mint.
Historical denominations of US coins, which no longer circulate, include:
The current dollar coin[?] has an image of Sacagawea on the obverse, and is minted of a golden colored brass alloy. This "golden dollar" was designed to replace the Susan B. Anthony dollar coin[?], which was produced from 1979-1981 and again in 1999. The size, weight, and electromagnetic characterstics of the Sacagawea dollar exactly match those of the Susan B. Anthony dollar, avoiding any need to modify vending machines.
wikipedia.org dumped 2003-03-17 with terodump